ColinS you are a Saint !!
I renamed the folder where the culprit resides and success......very many thanks.
I had searched the Microsoft forum but my BSODs started at 11pm on 29 May and when I searched there was nothing, the first report on the forum was 31 May.
I will also be feeding this back to Trusteer.
May I buy you a "virtual" pint of what you fancy ?